CN112795131B - Ageing-resistant polyformaldehyde material and preparation method thereof - Google Patents
Ageing-resistant polyformaldehyde material and preparation method thereof Download PDFInfo
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- 230000032683 aging Effects 0.000 title claims abstract description 80
- 239000000463 material Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 8
- -1 polyoxymethylene Polymers 0.000 claims abstract description 48
- 229930040373 Paraformaldehyde Natural products 0.000 claims abstract description 41
- 239000012745 toughening agent Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 20
- 230000003712 anti-aging effect Effects 0.000 claims description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 36
- 239000004014 plasticizer Substances 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 12
- 230000003078 antioxidant effect Effects 0.000 abstract description 9
- 239000003963 antioxidant agent Substances 0.000 abstract description 8
- 239000002250 absorbent Substances 0.000 abstract description 7
- 230000002745 absorbent Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
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- 230000000052 comparative effect Effects 0.000 description 19
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- 238000001125 extrusion Methods 0.000 description 13
- 239000010117 shenhua Substances 0.000 description 13
- 238000007873 sieving Methods 0.000 description 13
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 10
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 7
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
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- 230000001590 oxidative effect Effects 0.000 description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 5
- 235000019253 formic acid Nutrition 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- DKCPKDPYUFEZCP-UHFFFAOYSA-N 2,6-di-tert-butylphenol Chemical group CC(C)(C)C1=CC=CC(C(C)(C)C)=C1O DKCPKDPYUFEZCP-UHFFFAOYSA-N 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
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- QIUBKIZCXTVYHT-UHFFFAOYSA-N formaldehyde;imidazolidin-2-one Chemical compound O=C.O=C1NCCN1 QIUBKIZCXTVYHT-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000001746 injection moulding Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
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- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
- C08K5/3445—Five-membered rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Health & Medical Sciences (AREA)
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Abstract
The invention belongs to the technical field of polyoxymethylene, and in particular relates to an aging-resistant polyoxymethylene material and a preparation method thereof, wherein the aging-resistant polyoxymethylene material comprises the following components in parts by weight: 80-120 parts of polyformaldehyde and 0.5-10 parts of ageing-resistant toughening agent. The aging-resistant polyformaldehyde material is prepared by adding the aging-resistant toughening agent into polyformaldehyde, wherein the aging-resistant toughening agent can play roles in resisting aging and toughening at the same time, and the phenomenon that the toughness and aging resistance of the polyformaldehyde material are affected due to migration or precipitation of small molecular substances after long-term use due to addition of a plurality of small molecular substances such as a plasticizer, an antioxidant and a formaldehyde absorbent in the traditional process is avoided.
Description
Technical Field
The invention belongs to the technical field of polyoxymethylene, and particularly relates to an aging-resistant polyoxymethylene material and a preparation method thereof.
Background
Polyoxymethylene (POM), also known as acetal resin, polyoxymethylene, polyacetal, is a thermoplastic crystalline polymer, and has very good mechanical properties, wear resistance, creep resistance, chemical corrosion resistance, water resistance, etc. due to its extremely high degree of regularity of molecular chains, is known as "super steel" or "racing steel". However, the crystallinity of polyoxymethylene is as high as 80-90% due to the very high regularity, resulting in low notched impact strength and poor toughness of polyoxymethylene. In order to improve the toughness and the aging resistance of the polyoxymethylene material, it is generally necessary to additionally add a plasticizer to improve the heat property of the polyoxymethylene material and to delay the aging of the formaldehyde material by adding an antioxidant, a formaldehyde absorber, or the like.
Chinese patent document CN 107459760A discloses a polyoxymethylene material and a preparation method thereof, comprising the following components by mass: 70-100 parts of polyformaldehyde, 0.1-5 parts of catalyst, 0.5-15 parts of toughening agent, 0.1-10 parts of antioxidant, 0.1-5 parts of formaldehyde absorbent and 0.1-5 parts of formic acid absorbent. The toughness, ageing resistance and the like of the polyoxymethylene material are improved by adding a plurality of auxiliary agents. Although the addition of the auxiliary agents can play a certain role, the addition of excessive small molecular substances, especially small molecular substances with poor compatibility with polyoxymethylene, is extremely easy to migrate and even precipitate in the material during the use process, thereby losing the corresponding role.
Disclosure of Invention
In order to solve the problems, the invention discloses an anti-aging polyformaldehyde material and a preparation method thereof, wherein the anti-aging polyformaldehyde material is prepared by adding an anti-aging toughening agent into polyformaldehyde, and the anti-aging toughening agent can play roles in resisting aging and toughening at the same time, so that the problem that the toughness and the ageing resistance of the polyformaldehyde material are affected due to migration or precipitation of small molecular substances after long-term use due to the addition of a plurality of small molecular substances such as a plasticizer, an antioxidant and a formaldehyde absorbent in the traditional process is avoided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an aging-resistant polyoxymethylene material comprises the following components in parts by weight: comprises the components of polyformaldehyde and an anti-aging toughening agent, wherein the dosage of the anti-aging toughening agent accounts for 0.1-5% of the total mass of the polyformaldehyde
Preferably, the upper aging-resistant toughening agent accounts for 0.1-2% of the total mass of the polyoxymethylene.
Preferably, the polyoxymethylene is homo-polyoxymethylene or co-polyoxymethylene.
Preferably, the structural formula of the aging-resistant toughening agent is as follows:
the preparation method of the aging-resistant toughening agent comprises the following steps: weighing 3- (5-methyl-2-imidazolidinonyl) propionic acid, trimethylol orthopropionate and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid according to a molar ratio of 1:1:2, adding a proper amount of DMF into a reaction kettle, adding trimethylol orthopropionate, stirring until the materials are dissolved, respectively and independently dissolving 3- (5-methyl-2-imidazolidinonyl) propionic acid and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid into DMF, adding a small amount of p-toluenesulfonic acid and a proper amount of toluene into the reaction kettle, heating to 120 ℃, then slowly dripping a DMF solution of 3- (5-methyl-2-imidazolidinonyl) propionic acid and a DMF solution of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid into the reaction kettle respectively, wherein, the dropping speed of DMF solution of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid is 2 times of the dropping speed of DMF solution of 3- (5-methyl-2-imidazolidone) propionic acid, stirring and reacting until no water is generated in a water separator, then decompressing and distilling to remove solvent and unreacted micromolecule substances under the pressure of 0.4MPa, raising the pressure to 0.6MPa, continuously decompressing and distilling to remove middle boiling substances, washing residues with ethanol for three times, washing with water to be neutral, drying at 50 ℃ to constant weight, and obtaining the aging-resistant toughening agent, wherein the reaction equation is as follows:
a preparation method of an aging-resistant polyoxymethylene material comprises the following steps: and (3) melt blending the polyformaldehyde and the ageing-resistant toughening agent, and extruding to obtain the ageing-resistant polyformaldehyde material.
Preferably, the polyoxymethylene and the aging-resistant toughening agent are melt blended and then extruded and granulated by a double screw extruder.
The invention has the following beneficial effects:
(1) The aging-resistant polyformaldehyde material is prepared by adding the aging-resistant toughening agent into polyformaldehyde, wherein the aging-resistant toughening agent can play roles in resisting aging and toughening at the same time, and the phenomenon that the toughness and aging resistance of the polyformaldehyde material are affected due to migration or precipitation of small molecular substances after long-term use due to the addition of a plurality of small molecular substances such as a plasticizer, an antioxidant and a formaldehyde absorbent in the traditional process is avoided;
(2) The molecule of the aging-resistant toughening agent comprises a 2-imidazolidone formaldehyde absorbent structure, so that free formaldehyde generated by the decomposition of polyformaldehyde can be absorbed, the generation of formic acid is reduced to a certain extent, the acceleration of formaldehyde and formic acid on the degradation of the polyformaldehyde is slowed down, the thermal stability of the polyformaldehyde material is improved, in addition, the aging-resistant toughening agent also has two 2, 6-di-tert-butylphenol structures which have the same antioxidant effect as the antioxidant 1010, and can have good thermo-oxidative aging resistance effect, so that the addition of the whole aging-resistant toughening agent can have good aging resistance effect;
(3) The aging-resistant toughening agent disclosed by the invention is added into a polyoxymethylene system as a relatively small molecule, so that a certain plasticizer effect can be achieved, and moreover, as can be seen from the structural formula of the aging-resistant toughening agent, the part containing the 2-imidazolidone structure is equivalent to one side chain on the whole chain segment, so that the crystallinity is reduced, the hardness is further reduced, and the toughness is increased;
(4) The aging-resistant toughening agent of the invention has-CH similar to a polyoxymethylene chain segment on the main chain 2 The O-structure is beneficial to increasing the compatibility between the aging-resistant plasticizer and the polyoxymethylene.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a nuclear magnetic resonance spectrum of an aging resistant toughening agent of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to examples.
FIG. 1 is a nuclear magnetic resonance spectrum of an aging resistant toughening agent, 1H NMR (400 MHz, CDCl) 3 δ): 0.89 (a, 3H); 1.32-1.37 (b, 39H); 1.76-1.88 (c, 4H); 2.35 (d, 2H); 2.53 (e, 4H); 2.85 (f, 4H); 4.02 (g, 1H); 4.22 (H, 1H); 6.16 (i, 6H); 6.89 (k, 4H). And the absorption peak of each proton obtained by testing is completely consistent with the proton in the aging-resistant toughening agent, which indicates that the aging-resistant toughening agent is obtained.
Example 1
Mixing 80 parts of Shenhua MC90 polyformaldehyde and 4 parts of ageing-resistant plasticizer uniformly, adding into a double-screw extruder for melt blending, wherein the screw speed is 350r/min, the temperature of each section from a charging barrel to a machine head is 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃ respectively, the temperature of the machine head is 180 ℃, and obtaining the polyformaldehyde material through cooling, drying, granulating and sieving after extrusion.
Example 2
100 parts of Shenhua MC90 polyformaldehyde and 0.1 part of ageing-resistant plasticizer are taken, mixed uniformly, added into a double screw extruder for melt blending, the screw rotating speed is 350r/min, the temperature of each section from the charging barrel to the machine head is respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the temperature of the machine head is 180 ℃, and the polyoxymethylene material is obtained by cooling, drying, granulating and sieving after extrusion.
Example 3
Mixing 90 parts of Shenhua MC90 polyformaldehyde and 0.9 part of ageing-resistant plasticizer uniformly, adding into a double-screw extruder for melt blending, wherein the screw speed is 350r/min, the temperatures of all sections from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃, the machine head temperature is 180 ℃, and obtaining the polyformaldehyde material through cooling, drying, granulating and sieving after extrusion.
Example 4
Mixing 85 parts of Shenhua MC90 polyformaldehyde and 3.4 parts of ageing-resistant plasticizer uniformly, adding into a double-screw extruder for melt blending, wherein the screw speed is 350r/min, the temperatures of all sections from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃, the machine head temperature is 180 ℃, and obtaining the polyformaldehyde material through cooling, drying, granulating and sieving after extrusion.
Example 5
115 parts of Shenhua MC90 polyformaldehyde and 0.9 part of ageing-resistant plasticizer are taken, evenly mixed, added into a double screw extruder for melt blending, the screw rotating speed is 350r/min, the temperature of each section from the charging barrel to the machine head is respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the temperature of the machine head is 180 ℃, and the polyoxymethylene material is obtained by cooling, drying, granulating and sieving after extrusion.
Example 6
Mixing 95 parts of Shenhua MC90 polyformaldehyde and 1.5 parts of ageing-resistant plasticizer uniformly, adding into a double-screw extruder for melt blending, wherein the screw speed is 350r/min, the temperatures of all sections from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃, the machine head temperature is 180 ℃, and obtaining the polyformaldehyde material through cooling, drying, granulating and sieving after extrusion.
Example 7
120 parts of Shenhua MC90 polyformaldehyde and 0.6 part of ageing-resistant plasticizer are taken, mixed uniformly, added into a double screw extruder for melt blending, the screw rotating speed is 350r/min, the temperature of each section from the charging barrel to the machine head is respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the temperature of the machine head is 180 ℃, and the polyoxymethylene material is obtained by cooling, drying, granulating and sieving after extrusion.
Example 8
Mixing 110 parts of Shenhua MC90 polyformaldehyde and 2.2 parts of ageing-resistant plasticizer uniformly, adding into a double-screw extruder for melt blending, wherein the screw speed is 350r/min, the temperatures of all sections from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃, the machine head temperature is 180 ℃, and obtaining the polyformaldehyde material through cooling, drying, granulating and sieving after extrusion.
Comparative example 1
115 parts of Shenhua MC90 polyformaldehyde and 0.9 part of antioxidant 1010 are taken, evenly mixed, added into a double screw extruder for melt blending, the screw rotating speed is 350r/min, the temperature of each section from the charging barrel to the machine head is respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the temperature of the machine head is 180 ℃, and the polyoxymethylene material is obtained by cooling, drying, granulating and sieving after extrusion.
Comparative example 2
115 parts of Shenhua MC90 polyformaldehyde and 0.9 part of 2-imidazolidone are taken, evenly mixed, added into a double screw extruder for melt blending, the screw rotating speed is 350r/min, the temperature of each section from the charging barrel to the machine head is respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the temperature of the machine head is 180 ℃, and the polyoxymethylene material is obtained by cooling, drying, granulating and sieving after extrusion.
Comparative example 3
115 parts of Shenhua MC90 polyformaldehyde, 0.6 part of antioxidant 1010 and 0.3 part of 2-imidazolidone are taken, mixed uniformly, added into a double screw extruder for melt blending, the screw speed is 350r/min, the temperatures from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and the machine head temperature is 180 ℃, and the polyformaldehyde material is obtained through cooling, drying, granulating and sieving after extrusion.
Comparative example 4
115 parts of Shenhua MC90 polyformaldehyde, 0.23 part of 3- (5-methyl-2-imidazolidone) propionic acid, 0.23 part of original trimethylol propionate and 0.46 part of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid are taken, evenly mixed, added into a double screw extruder for melt blending, the screw speed is 350r/min, the temperatures from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃ at 180 ℃, the machine head temperature is 180 ℃, and the polyformaldehyde material is obtained through extrusion, cooling, drying, granulating and sieving.
Comparative example 5
115 parts of Shenhua MC90 polyformaldehyde, 0.3 part of 3- (5-methyl-2-imidazolidone) propionic acid and 0.6 part of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid are taken, uniformly mixed, added into a double screw extruder for melt blending, the screw rotation speed is 350r/min, the temperatures from a charging barrel to a machine head are respectively 165 ℃, 170 ℃, 175 ℃, 180 ℃ and 180 ℃ at the machine head temperature of 180 ℃, and the polyformaldehyde material is obtained through extrusion, cooling, drying, granulating and sieving.
The polyoxymethylene pellets prepared in examples 1 to 8 and comparative examples 1 to 5 were injection molded on an injection molding machine into standard test bars, and each performance test was performed with the test results shown in tables 1 to 2:
table 1 initial properties
As can be seen from Table 1, the polyoxymethylene materials prepared in examples 1 to 8 have higher notched impact strength and higher elongation at break, which means that the polyoxymethylene materials have better toughness, and at the same time, the heat distortion temperature is 121 to 136℃and the heat resistance is better. In comparative example 1, the antioxidant 1010 is used for replacing an aging-resistant toughening agent, and although the antioxidant 1010 can effectively delay the thermal oxidative degradation of the polyoxymethylene material, the antioxidant 1010 alone cannot play a better role in resisting thermal oxidative aging because the antioxidant cannot absorb free formaldehyde generated by the decomposition of polyoxymethylene. In comparative example 2, 2-imidazolidone is adopted to replace an aging-resistant toughening agent, although the 2-imidazolidone can absorb free formaldehyde generated by decomposition of polyformaldehyde, reduce formic acid generation, slow down the accelerating effect of formaldehyde and formic acid on degradation of polyformaldehyde and improve thermal stability, but cannot play an antioxidant role and cannot play a better role in resisting thermo-oxidative aging when being singly used. In comparative example 3, the antioxidant 1010 and the 2-imidazolidone in corresponding proportions are adopted to replace the aging-resistant toughening agent, and the aging-resistant toughening agent has the functions of the antioxidant and the formaldehyde absorbent, but compared with the aging-resistant toughening agent of the application, the aging-resistant toughening agent has no segment structure similar to that of the formaldehyde, has poor compatibility with a system and has relatively poor effect. Comparative example 4 the aging-resistant toughening agent was replaced with three monomers for synthesizing the aging-resistant toughening agent of the present invention, and although the corresponding structures in 3- (5-methyl-2-imidazolidone) propionic acid and 3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionic acid can exert a certain effect on thermo-oxidative aging resistance, the addition of the three as small molecular substances, in particular, the addition of trimethylol orthopropionate, can adversely affect the properties of polyoxymethylene materials. Comparative example 5 the performance was slightly improved by removing the trimethylol orthopropionate from comparative example 4, but far less than examples 1-8.
TABLE 2 Properties after thermal oxidative aging
| Notched impact strength/KJ/m 2 | Tensile Strength/MPa | Elongation at break% | Heat distortion temperature/°c | |
| Example 1 | 9.3 | 57.2 | 54.4 | 128 |
| Example 2 | 5.9 | 60.8 | 44.5 | 110 |
| Example 3 | 7.1 | 70.7 | 49.3 | 116 |
| Example 4 | 8.9 | 60.4 | 51.5 | 122 |
| Example 5 | 6.6 | 64.5 | 48.2 | 115 |
| Example 6 | 7.4 | 65.3 | 47.0 | 119 |
| Example 7 | 6.2 | 64.1 | 43.9 | 113 |
| Example 8 | 7.8 | 62.8 | 47.6 | 121 |
| Comparative example 1 | 4.6 | 54.7 | 48.0 | 83.8 |
| Comparative example 2 | 4.1 | 42.1 | 39.1 | 72.6 |
| Comparative example 3 | 5.3 | 48.0 | 44.2 | 95.2 |
| Comparative example 4 | 3.4 | 35.3 | 39.4 | 84.7 |
| Comparative example 5 | 3.7 | 40.5 | 40.3 | 90.6 |
The conditions for thermo-oxidative aging in table 2 are: the aging temperature is 120 ℃, and the aging time is 720h. As can be seen from the comparison of the data in Table 2 with Table 1, the change rate of the data after thermal oxidative aging is not high in examples 1-8 in Table 2, while the decrease of the data after thermal oxidative aging is obvious in comparative examples 1-5, which indicates that the polyoxymethylene materials prepared according to the technical scheme of the present application have better thermal oxidative aging resistance, while the polyoxymethylene materials prepared in comparative examples 1-5 have poorer thermal oxidative aging resistance.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. An aging-resistant polyoxymethylene material, characterized in that: the components comprise polyformaldehyde and an anti-aging toughening agent, wherein the dosage of the anti-aging toughening agent accounts for 0.1-5% of the total mass of the polyformaldehyde;
the structural formula of the aging-resistant toughening agent is as follows:
2. the aging-resistant polyoxymethylene material as set forth in claim 1, wherein: the usage amount of the aging-resistant toughening agent accounts for 0.1-2% of the total mass of the polyformaldehyde.
3. The aging-resistant polyoxymethylene material as set forth in claim 2, wherein: the polyoxymethylene is homo-polyoxymethylene or co-polyoxymethylene.
4. A method for preparing an aging-resistant polyoxymethylene material as set forth in any one of claims 1 to 3, characterized in that: the method comprises the following steps: and (3) melt blending the polyformaldehyde and the ageing-resistant toughening agent, and extruding to obtain the ageing-resistant polyformaldehyde material.
5. The method for preparing the aging-resistant polyoxymethylene material as set forth in claim 4, wherein: and after the polyformaldehyde and the ageing-resistant toughening agent are melt blended, extruding and granulating by a double-screw extruder.
Priority Applications (1)
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| CN102924862A (en) * | 2012-11-29 | 2013-02-13 | 开滦（集团）有限责任公司 | Polyformaldehyde modified material and preparation method thereof |
| EP2931804B1 (en) * | 2012-12-13 | 2018-08-08 | Ticona LLC | Laser-weldable electrostatically dissipative polyoxymethylene based on conductive metal filler |
| CN111548598A (en) * | 2020-06-17 | 2020-08-18 | 湖北合聚高分子材料有限公司 | A kind of aging-resistant high-toughness polyoxymethylene material and preparation method thereof |
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